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Stock Options (Tables)
 12 Months Ended
Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity
 
2023
2022
2021
Options available for grant at end of year356,156381,531423,969
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
Following is a summary of activity in the Restricted Stock Awards ("RSA")/Units for the periods indicated:
  
 202320222021
 SharesGrant-Date Fair Value*SharesGrant-Date Fair Value*SharesGrant-Date Fair Value*
Awards outstanding at beginning of year97,630 $133.67 80,616 $129.53 91,043 $104.77 
Granted45,267 178.66 48,396 133.70 35,224 157.00 
Exercised(33,847)129.51 (29,922)122.19 (45,651)101.36 
Canceled(15,072)118.97 (1,460)143.82 — — 
Awards outstanding at end of year93,978 $158.99 97,630 $133.67 80,616 $129.53 
*Weighted Averages
Qualified Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity
Following is a summary of activity in the Incentive Stock Option Plans for the periods indicated:
 
 202320222021
 Shares
  Exercise
   Price*
Shares
  Exercise
   Price*
Shares
  Exercise
   Price*
Options outstanding at beginning of year84,647 $106.43 87,610 $91.24 100,920 $68.58 
Granted14,425 178.25 17,625 137.93 18,900 156.38 
Exercised(21,260)72.09 (14,780)50.79 (30,210)53.68 
Canceled(1,950)148.08 (5,808)114.48 (2,000)130.92 
Options outstanding at end of year75,862 128.64 84,647 106.43 87,610 91.24 
Options exercisable at end of year34,027 $100.00 43,412 $78.50 49,360 $61.21 
Options available for grant at end of year273,558  286,033  297,850  
*Weighted Averages
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range Options outstanding and exercisable at December 31, 2023 were as follows:
 
Qualified Stock OptionsOptions OutstandingOptions Exercisable
 
 Shares
Remaining Contractual Life (yrs)*Exercise Price*SharesExercise     Price*
Range of Exercise Price     
$52.51 - $83.99
12,225 2.23$62.30 12,225 $62.30 
$92.50 - $138.75
34,852 6.65$120.20 16,432 $109.62 
$156.38 - $234.57
28,785 8.13$167.04 5,370 $156.38 
Total75,862   34,027  
*Weighted Averages
Non Qualified Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity
Following is a summary of activity in the Non-Qualified Stock Option Plans for the periods indicated:
 
 202320222021
 SharesExercise Price*SharesExercise Price*SharesExercise Price*
Options outstanding at beginning of year1,000 $53.51 2,000 $53.51 3,000 $53.51 
Granted— — — — — — 
Exercised(1,000)53.51 (1,000)53.51 (1,000)53.51 
Canceled— — — — — — 
Options outstanding at end of year— — 1,000 53.51 2,000 53.51 
Options exercisable at end of year— $— 1,000 $53.51 2,000 $53.51 
*Weighted Averages